Apparatus for controlling the draft on furnaces



J. W. DRAKE.

APPARATUS FOR CONTROLLING THE DRAFT ONFURNACES.

APPLICATION man MAIL-l0, 19H.

1,414,631. Patented y 1922.

4 SHEETS-SHEET 1.

J. W. DRAKE.

APPARATUS FOR CONTROLLING THE DRAFT 0N FURNACES.

, APPLICATION FILED MAR- 10' 1917. 1,414,631.

Patented May 2, 1922.

4 SHEETSSHEET 2.

v .I. W. DRAKE.

- APPARATUS FOR CONTROLLING THE DRAET 0N FURNACES.

APPLICATION FILED MAR- 10' I9- 4 SHEETS- SHEET 3.

1,414,631 I Patented May2,192 2.

1. w. DRAM-1..

APPARATUS FOR CONTROLLING THE DRAFI 0N FURNACE S. APPLICATION men MM!-0. 1917.

1,414,631; Patented May2, 1922.

4 SHEETS-SHEET 4- JTE'EJ .I'TE 7 entries srares JONAS wrnrnrn DRAKE,

earner ser es. v

033. .ILALIFAX, ENGLAND.

' arrannrus roa conraornnvernn nnnrr on summons;

To all whom it may concern:

'Be it known that I, JoNAs lVILrni-o DRAKE, a subject of the King ofGreat Britain, and resident of Halifax, in the county of York, England,have invented a certain new and useful Improvement in ApparatusforControlling the Draft on Furnaces, of. which the following description,having reference totthe accompanying sheets of'drawings, is aspecification.

In connection with many andvaried fur naces, but especially inconnection with the regenerative furnaces used in "the inanufacture ofgas (where the draft thereon is induced by a chimney or uptake) thedraft on the'furnace and therefore the amount of air for supportingcombustion therein is varied according to atmospheric conditions,eitheras to the temperature of the atmosphere or the direction of the wind'orboth, with the result that atone timethe heat of the furnace orconsumption of fuel therein may be as desired, yet at another time thedraft thereon may be so strong as to increase the heat thereof andconsequently the consumption of fuel therein far'beyond the desired orin a part adjoining said flue between the furnace and the uptake of thech1mney,so

th'at'the draft on said chimney, when it exceeds a given force, will actupon my apparatus causing same toadmit air from the outside and notthrough the furnace, the volume admitted being such as to meet thedemands of the extra draft and therefore I keep the draft on the furnaceconstant or opening for the admission of air, but by being connectedtoother parts these latter are by its comparatively slight movementoperated by it to open inlet spaces of considerable magnitude. 7

1n carrying my" invention into effect I Specification of Letters Patent.

make use the devices illustrated in the certain part so that oscillatorymotion'may be transmitted thereto instead of said part havingreciprocatory motion by b6111 con-v 1and2.

Patented May 2, 1922.

Application filed March 10, 1917. Serial No. 154,063. I

. b 7 V structed and arranged as illustrated byFigs.

'Fig. 5 is a similar view to Fig. l but illus- I trates another form ofthe apparatus and method of mounting same so that oscillatory instead ofreciprocatory motionmay be made use of.

Fig. 6 is a sectional side elevation of a modified form of apparatushereinafter described. r

Fig. 7 is a .view of the part shown by Fig. 6 as seen'in the directionindicated by the arrow at. v

Fig. 8 issectional side'elevation of a further modification hereinafterdescribed.

Most of the parts of the apparatus are constructed of sheet metal whichiscomparatively thintherefore'the parts of it,

which are illustrated as being cut through,

are shown in lines of increased thickness instead of being shown bysection lines.

To attain the object of my invention I mount an appropriatebell orothershaped device 2 which wiltcover or take over av sleeve 3 (or' otherstructure as hereinafter described) in order that same may movevertically over said sleeve 3 with a mmimum of space between the outerperiphery of.

the latter and the inner surface of the former so that as little leakageof air as possi ble will take place through such space. The bell 2 isconnected by a light connecting rod, cord or wire 5 to the arm of alever 6 which is pivoted at 6 upon a horizontal support 7. This support7 is mounted upon the vertical bars 8 andS. The other arm of the lever 6has suspended from it by means of the connecting wire or cord 5 anotherbell 9. This bell 9 takes over a sleeve or fixed bell l0 which ismounted within it and scribed. I'llhrOugh the walls of the bell 9 slots9 which haslits upper end covered by the end wall 10 for the purposeshereinafter de- (the lengths of which extend circumferentially) areformed and correspond. in numher and size approximately with slots 1Oformed through the wallsof the inner bell 10. These slots in both casesare approximately'of even width while the width of'the metal as 9 land10 between these slots is rather larger in order that same is enabled tocover theopeni-ngs or. slots in each case. Thus when the outer hell 91s-1n its normal position over the inner bell 10 (as lllustrated by Fig.l) the solid. portion 9 of the walls of thesaid bell 9 cover theopenings 10 of 5 the inner bell lO while the solid portions walls of thehell 9.

of the wall of the inner bell 10 will cover the siots or openings 9which are through the The hell 9 with its counterbalancing weight l6e'isarranged to be heavier than thebell 2 consequently when inits normalposition-the lower edge 2 of the hell 2 will occupy a position above thecase or stop piece 4 surrounding the sleeve '3 and this space betweenthe lower edge of the bell 2 and the annular piece 42' approximatelyequals the spaces 9 and 10 through the walls of the bells 9 and 10. isillustrated the bells 2 and 9 and the parts in connection therewith aremount 7 w edabove acavity or space 11 which is enclosed at its base'andall its surrounding walls except the opening 12,. which leads therefrominto the, chimney or uptake 13, and the opening 14: which leads throughthe upper wall ofsaid' cavity 11 into the bell and sleeve 2 and 3respectively.

A further opening 15 is alsomade through the upper wall of-the cavity 11to lead into the inner bell 10. .As is before stated the hell 9 isarranged to be slightly heavier than the bell 2 or this may be-madeadjustable by'having v counterbalancing weights l6 and 16 mounted. uponthe lever .6 to attain the object de "sired. As isbefore stated thelever 6 is mounted upon its fulcrum which is of. a character that w1llreduce friction to a minimum in order that a comparatively small.

force acting upon the bell'2 is enabled to have the elfect of causingsame to descend to raise the bell 9 so that the slots made through samewill be brought opposite'the slots made through the walls of the bell l0within it.

As. will be observed the apparatus is mounted so that the uptake of thechimney 13'has free access to theinterior of the chamber 11, the sleeve3 and bell 2 as well as to the .bell 10 so that the draft on said-uptakemwhen exceedinga certain power causes the bell 2to descend byacting directly thereon to somewhat exhaust or suck away the air from.within the chamber 11 and the sleeve and bell 3 and 2, whereas the samesuction does not interfere with the air within thebell 9 since the coverl0 of the bell 10 within it, is a protection against such action Fromthe foregoing description it will be seen that when the draft on thechimney exceeds a given power, it has the effect of causing the hell .2to descend and simultaneously causes the hell 9 to rise ini order thatcool air from the atmosphere may then be permitted to pass through theopenings in the two bells 9 and 10 down into the chamber 511 throughsaid chamber and into the uptake lBsomewhat asindicated by the arrows'tocounteract the draft in said up take in order to bring it to its normalconditionson which the descending of the-bell '9 will again bring theparts'into their norlaterally by the bearing 10 said bell 10 may haveoscillatory motion transmitted to it.- In this case the bell 9 is fixedand has the bearing 10 mounted upon it, while through a lateral openingin said bearing, an arm 10 may extend to beengag'ed with by a connectingrod 5*. The arm 10 is fixed to the shaft 10 and the rode engag ing withit is coupled toa'pendant arm 6 of the lever 6, by which arrangement themovements of the hell 2 are transmitted to the bell 10 to cause it tooscillate in order to bring its slots 1O opposite the slots 9 inthe bell9; In this arrangement of devices the slots in the, bells 9 and 10 aremade to extend lengthwise.

Insteadtof mounting the bells 9 and; 10

with their. axes in the vertical plane I may' arrange them to have theiraxes inthe horizontal plane and I may then'modifyrtheir shape byhavingthem of semi-cylindrical form as shown by Fig. 5 in whicharrange-' ment the semi-cylindrical drum. 17 takes theplace of the hell9 while the drum 18 takes the place of the bell 10. The semi-cylindricaldrum 17 is pivoted at each of its'extremie ties 17 upon bearings 17which will produce, little friction against its oscillations. The drum17 has longitudinal slots 17 formed .through its walls correspondingwith slots 18 formed: through the inner semi-cylindrical drum 18 and theweighting of the drum 17 by the counterbalancing weight 16 causes it tooccupy a normal position as illustrated by Fig. 5 sothat on the draft inthe uptake acting upon the hell 2,.

it causes this bell to descend thus bringing with it the'lever 6 tooscillate the outer V drum 17 to which it is connected by the connectingrod 5 so as to effect the counteracting ofv the draft as hereinbeforeexplained.

By makmg use of curved or segmental drums (17, 18) one to rotate oroscillate over -or within the other, I may make use of a tudinallytherefrom have the drum 18 fixed I upon them. These arms and the drum 18are counterbalanced by the weight 16 which is adjusted so that when asupplementary counterbalancing weight 16 is in its position nearest thepivots 22 the normalposition of the valve 22 will be where it restsagainst the encircling flange 24 (which covers the outer edges of thevalve 22 as shown byFig. 6) by which arrangement we may then adjust itto move by the action of the draft of the chimney under any greaterweight that may be desired by moving said weight 16 along its supportingbar 16 In this arrangement of the devices the sleeve 3 is placedhorizontally andleads to the chimney 13 without passing through thecavity 11. r

As a further modification I may arrange the inner drum 18 as illustratedby Fig. 8 so that it shall be fixed and have egress from it through theopening 19 in the upper walls of the cavity 11. In this case the outerdrum 17 which is pivoted at 17 will have its wall 17 brought under theaction of the draft through the uptake 13 and cavity 11 which has accessto said wall 17 through the open ing 20, thus when the draft exceeds thedesired strength said wall 17 will be drawn in a downwarddirection-suiiiciently to cause the outer drum 17 to oscillate and bringthe openings through its wall opposite to the openings through the drum18 to permit air to enter the cavity within in order that same may passthrough the chamber 11 to the uptake as will be understood.

In the varied forms of the hereinbefore described apparatus I haveillustrated the bell 2 as having great influence over the parts whichcontrol the openings for the ingress of cool air or in other words Ihave shown the apparatus so constructed and arranged that by a slightmovement on the part of the moving body actuated by the draft of thechimney considerable space is afforded for the ingress of air and thatto a greater extent than may sometimesbe required, hence undercertainconditions it.

may be possible to make use of bells suchas 9 and 10 without slots oropenings but with sufficient freedom at their bases as to enable themovement of the one over the surface of the other to lay baresuchspaceor opening for the ingress of air as .will answer the purposes desired.

The bells 2, the wall 17 and the valve 22 arethe parts primarily movedby the chimneys draft and in no case do they by such movement uncoverany passage in which they are situated, to permit the ingress of air.And since the functions of the bells 2, the walls 17, and the valve 22are in all cases identical, the word valve used in the.

claiming clauses has reference to one or other of said devices.

In the accompanying illustrations the bells or apparatus are shownasmounted over a cavity 11 which is an off-shoot from the chimney oruptake 13 but I am aware that my apparatus may be placed in anyhorizontal flue or other appropriate position where itcan operatebetween the furnace and the chimney or uptake. I

Such being the nature and object of my said invention what I claim is:

1. In an apparatus for the purpose described, the combination of achimney having two openings to the outer air formed therein, a valvesupported to close one of said openings, means controlling the admission of air to the other opening comprising a stationary slottedmember and a movable slotted member,-and means connecting the lastmember and said valve.

2. In an apparatus forthe purpose described, thecombinat-ion'of achimney hav-' ing two openings to the outer air formed thereln, a valvesupported to close one of said openings, means controlling theadmissionof air to the other opening comprising a stationary slotted member and amovable slotted member, and arms extending from the valve and supportingsaid movable slotted member.

3. In an apparatus for the purpose described, the combination of achimney having two openings'to the outer air formed therein, a" valvesupported to close one of said opemngs, means controlling the admissionof air to the other opening compris-' ing a stationary slotted memberand a movable slotted member, a lever fulcrumed between thevalve andmovable slotted member to rock about a horizontal axis, connectionsbetween one arm of said lever and the valve,

and means connecting the'other arm of the lever to said movable slottedmember.

J. WILFRI-D DRAKE.

